Ghostty's developer's new terminal Rex runs 10,000 sessions simultaneously, using only 3.8GB of memory.
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Beating AI Express News: Ghostty creator Mitchell Hashimoto has announced scalability tests for his new terminal, Rex. Designed for long-lived sessions and remote connections, Rex allows terminal tasks to run continuously in the background. During the test, Rex maintained 10,000 active terminal sessions simultaneously, consuming approximately 3.8GB of memory while remaining responsive. The team has paused further scaling for now, with the next target being 100,000 sessions. At the 10,000-session mark, much of the overhead no longer stemmed from the terminal itself. The first bottleneck came from Linux’s file descriptor table, the system’s record of files and connections opened by processes. After terminal sessions exceeded around 5,000, each new process added roughly 512KB of overhead for this table alone, even though only about 4 file descriptors were actually used. Rex has since added a segment of C code to shrink this allocated space to the actual required size. Another issue was threads: Previously, Rex assigned one thread per active terminal session to wait for data, leading to excessive memory overhead at scale. Now, if a terminal has no read activity for 2 consecutive seconds, it is handed over to a shared thread for unified monitoring.
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